/*
 *  ircd-hybrid: an advanced Internet Relay Chat Daemon(ircd).
 *  m_links.c: Shows what servers are currently connected.
 *
 *  Copyright (C) 2002 by the past and present ircd coders, and others.
 *
 *  This program is free software; you can redistribute it and/or modify
 *  it under the terms of the GNU General Public License as published by
 *  the Free Software Foundation; either version 2 of the License, or
 *  (at your option) any later version.
 *
 *  This program is distributed in the hope that it will be useful,
 *  but WITHOUT ANY WARRANTY; without even the implied warranty of
 *  MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
 *  GNU General Public License for more details.
 *
 *  You should have received a copy of the GNU General Public License
 *  along with this program; if not, write to the Free Software
 *  Foundation, Inc., 59 Temple Place, Suite 330, Boston, MA  02111-1307
 *  USA
 *
 *  $Id: m_links.c 369 2006-05-02 21:34:55Z jon $
 */

#include "stdinc.h"
#include "handlers.h"
#include "client.h"
#include "irc_string.h"
#include "ircd.h"
#include "numeric.h"
#include "s_serv.h"
#include "send.h"
#include "s_conf.h"
#include "msg.h"
#include "motd.h"
#include "parse.h"
#include "modules.h"
#include "hook.h"

static void do_links(struct Client *, int, char **);
static void m_links(struct Client *, struct Client *, int, char **);
static void mo_links(struct Client *, struct Client *, int, char **);
static void ms_links(struct Client *, struct Client *, int, char **);

struct Message links_msgtab = {
	"LINKS", 0, 0, 0, 0, MFLG_SLOW, 0,
	{m_unregistered, m_links, ms_links, m_ignore, mo_links, m_ignore}
};

#ifndef STATIC_MODULES
const char *_version = "$Revision: 369 $";
static struct Callback *links_cb;

static void *
va_links(va_list args)
{
	struct Client *source_p = va_arg(args, struct Client *);
	int parc = va_arg(args, int);
	char **parv = va_arg(args, char **);

	do_links(source_p, parc, parv);
	return NULL;
}

void
_modinit(void)
{
	links_cb = register_callback("doing_links", va_links);
	mod_add_cmd(&links_msgtab);
}

void
_moddeinit(void)
{
	mod_del_cmd(&links_msgtab);
	uninstall_hook(links_cb, va_links);
}

#endif

static void
do_links(struct Client *source_p, int parc, char **parv)
{
	if(IsOper(source_p) || !ConfigServerHide.flatten_links)
	{
		char *mask = (parc > 2 ? parv[2] : parv[1]);
		const char *me_name, *nick, *p;
		struct Client *target_p;
		char clean_mask[2 * HOSTLEN + 4];
		dlink_node *ptr;

		if(!EmptyString(mask))	/* only necessary if there is a mask */
			mask = collapse(clean_string
					(clean_mask, (const unsigned char *) mask, 2 * HOSTLEN));

		me_name = ID_or_name(&me, source_p->from);
		nick = ID_or_name(source_p, source_p->from);

		DLINK_FOREACH(ptr, global_serv_list.head)
		{
			target_p = ptr->data;

			if(!EmptyString(mask) && !match(mask, target_p->name))
				continue;

			if(target_p->info[0])
			{
				if((p = strchr(target_p->info, ']')))
					p += 2;	/* skip the nasty [IP] part */
				else
					p = target_p->info;
			}
			else
				p = "(Unknown Location)";

			/* We just send the reply, as if they are here there's either no SHIDE,
			 * or they're an oper..  
			 */
			sendto_one(source_p, form_str(RPL_LINKS),
				   me_name, nick,
				   target_p->name, target_p->servptr->name, target_p->hopcount, p);
		}

		sendto_one(source_p, form_str(RPL_ENDOFLINKS),
			   me_name, nick, EmptyString(mask) ? "*" : mask);
	}
	else
	{
		/*
		 * Print our own info so at least it looks like a normal links
		 * then print out the file (which may or may not be empty)
		 */
		sendto_one(source_p, form_str(RPL_LINKS),
			   ID_or_name(&me, source_p->from),
			   ID_or_name(source_p, source_p->from), me.name, me.name, 0, me.info);
		send_message_file(source_p, &ConfigFileEntry.linksfile);
		sendto_one(source_p, form_str(RPL_ENDOFLINKS),
			   ID_or_name(&me, source_p->from),
			   ID_or_name(source_p, source_p->from), "*");
	}
}

/*
 * m_links - LINKS message handler
 *      parv[0] = sender prefix
 *      parv[1] = servername mask
 * or
 *      parv[0] = sender prefix
 *      parv[1] = server to query 
 *      parv[2] = servername mask
 */
static void
m_links(struct Client *client_p, struct Client *source_p, int parc, char *parv[])
{
	static time_t last_used = 0;

	if((last_used + ConfigFileEntry.pace_wait) > CurrentTime)
	{
		sendto_one(source_p, form_str(RPL_LOAD2HI), me.name, source_p->name);
		return;
	}
	else
		last_used = CurrentTime;

	if(!ConfigServerHide.flatten_links)
	{
		mo_links(client_p, source_p, parc, parv);
		return;
	}

#ifdef STATIC_MODULES
	do_links(source_p, parc, parv);
#else
	execute_callback(links_cb, source_p, parc, parv);
#endif
}

static void
mo_links(struct Client *client_p, struct Client *source_p, int parc, char *parv[])
{
	if(parc > 2)
		if(!ConfigFileEntry.disable_remote || IsOper(source_p))
		{
			if(hunt_server(client_p, source_p, ":%s LINKS %s :%s", 1, parc, parv)
			   != HUNTED_ISME)
				return;
		}

#ifdef STATIC_MODULES
	do_links(source_p, parc, parv);
#else
	execute_callback(links_cb, source_p, parc, parv);
#endif
}

/*
 * ms_links - LINKS message handler
 *      parv[0] = sender prefix
 *      parv[1] = servername mask
 * or
 *      parv[0] = sender prefix
 *      parv[1] = server to query 
 *      parv[2] = servername mask
 */
static void
ms_links(struct Client *client_p, struct Client *source_p, int parc, char *parv[])
{
	if(hunt_server(client_p, source_p, ":%s LINKS %s :%s", 1, parc, parv) != HUNTED_ISME)
		return;

	if(IsClient(source_p))
		m_links(client_p, source_p, parc, parv);
}
